Washing machine with water balancer



' y 22, 1952 A. H. DAVIS ET AL 2,603,982

WASHING MACHINE WITH WATER BALANCER Filed Jan. 28, 1947' 4 Sheets-Sheet 2 INVENTORS A RcH/BALD H- DA v/s & RALPH L. AECHBOAD A TTORNE Y3 y 22, 1952 A. H. DAVIS ETAL 2,603,982

WASHING MACHINE WITH WATER BALANCER Filed Jan. 28, 1947 v 4 Sheetg-Sheet 3 Fig.3

JNVENTORS ARCH/BALD H- DA W5 41 7841 PH A APCHBOLD A TTORIVE Y5 v Filed Jan. 28, 1947 J y 1952 A. H. DAVIS E'TAL 2,603,

WASHING MACHINE WITH WATER BALANCER 4 Sheets-Sheet 4 INVENTORS ARCH/BALD h- .DA V/S ATTOHVEXS Patented July 22, 1952 Archbold, Euclid, Ohio, assignors to The Apex Electrical Manufacturing 00., Cleveland, Ohio,

a corporation of Ohio Application January 28, 1947, Serial No. 724,876

This invention relates to washing machines of acentrifugal drying type, and more particularly to means to balance the rotating tub or container of the machine. In washing machines of the type to which this invention relates, the tub or 00111". taineris provided with a plurality of pockets for the reception of water and the device is arranged so that water is distributed to pockets in order to correct unbalance due to :disarrangement of the articles within the tub. When the tub is rotated below its criticalspeed with unbalance present, the tub and its supports tend to tilt or lean in the direction of the heavy side of the tub. In the type of machine to which this invention relates, this results .in arelease of water under pressure that is directed to an area of the .tubthat is substantially .1 80 displaced from the heavy-crunbalancedside of the tub. 1, ,One form of valve which willaccomplish this is shown in the application of Gerald I. Cooker-ill and Ralph L. Archbold, Serial No. 704,482, filed October 19, 1946, now Patent No. 2,574,170. Since, in'the present invention, the water for balancing is emitted from avalve that does not turn with the tub, we have found that there is a timelag-or dead space in such construction generally caused by the fact that it takes a certain length of time for-water that leaves the valve to traverse the clearance space between the valve and the means on the. tub, designd to receive the water for balancing purposes. Likewise, it may be that a deflector for the water is required in order to change the direction of flow after leaving the distributing valve, in which case it does not matter how small the clearance is between the rotating tub parts and the fixed valve there would bean appreciable time lag causedby the deflector.

We have .foundthat asa result of this time lag, water that is emitted by the valve opposite the heavy side of: the tub does not-enter the receiving means on the tub opposite its heavy side, rather it tends to enter the receiving means on thetub at an area which is displaced from the correct point of application in a direction contrary to that-of tub rotation.

In addition to the considerations just mentioned, we have found that there are additional factors which-must be accounted for if one of the elementspof the water balancing relief valve is made of rubber or other resilient material. For one thing, the rotating pressure of the unbalanced member against the rubber valve, such as that described in the Cockerill and Archbold application referredto previously, tends to crowd the rubber of the valve around in the direction of 12 Claims.; (01. 74-573) tub rotation. This, in turn, slightly advances the rubber on the opposite or light side of the tub. so that the water bleeding orifice tends to lead slightly the area at whichv it would. otherwise occur. on the other hand, there is. another phenomenon resulting from use of a rubber valve in that due to hysteresis effects whenthe rubber is compressed on one side and pressure. is relieved thereon on the other side, there is a time lag in the development of the water bleed opening, which lag is in the opposite direction from the rubber crowding efiect described previously. Generally speaking, the time lag due to physical separation of the parts which must be traversed by the water stream is greater than the net lag. due to the nature of the rubber valve material just described, but it is desirable to consider all of these factors in designing the given machine.

Accordingly, it is an object of this invention to compensate for the effect of the time lags just described and insure that under average conditions the water is directed toward and reaches an area in the tub opposite the area of unbalance,

' with the tub rotating below. its critical speed.

We accomplish this by providing channels that direct the water received from the distributing valve into the balancing pockets of the tub, which channels are carried by the tub and are so formed that their terminal ends are displaced from their entrances in the direction of spin. Thereby. under average conditions, time lag is compensated for and the water is distributed to those balancing. pockets that are directly opposite the unbalanced areas.

In accordance with the principles of mechanics, there is a reversal of operation of an unbalanced rotating mass when the velocity passes from below the critical speed to above thecritical speed of the system. The condition which exists when the mass is rotated below its critical speed has been mentioned. However, when the system is rotated above its critical speed its action is entirely different. Formerly, it was assumed that the washer was being rotated below its critical speed in which case the tub support leans towards the heavy or unbalanced side with the center of rotation of the tub itself revolving conically about a neutral axis. After the tub passes through its critical speed these conditions are reversed and the axis .of rotation of the tub moves so that the center of mass lies along the neutral axis of the assembly. This means that insofar as inclination of the supporting shaft of the tubis concerned the situa-ticn is diametrically reversed from that existing below the critical speed of the assembly, and water will emit from the other side of the balancing valve. Therefore, if it is desired to operate a machine above the critical speed, an arrangement of the channels that direct water to the balancing pockets will be somewhat different. For example, if the advance provided by the channel is equal to an angle A in the direction of spin when the system is operated below the critical speed, then it will be necessary to make the angle,

formed between the outlet of the channel and its inlet equal to 180 minus A against the direction pockets can be designed to serve either tyne emachine.

We have also found that when a stream of water is emitted from a fixed device such as the distributing valve of the system, that the trailing wall of the channel strikes the stream of water in a direction perpendicular to its direction of motion causingsplattering of the water. Some of the splattered water eventually finds its way into the channel, but it is an even chance thatthe splattered water will rebound in a direction such that it fails to enter the channel. This reduces the eifectiveness of the device and another object of our invention is to insure that all'the splattered Water is conducted to the balancing pockets. We accomplish this by giving a novel shape to the walls of the water-conducting channels.

We have found that in water balancing machines of the type to which this invention relates, the water balancing pockets distributed about the tub or clothes container tend to gradually become filled as the distribution of the articles in the container changes. Thus, it is not uncommon for'the majority or all the pockets to receive balancing water at one time or another during the centrifugal drying operation, and if that operation were continued for an appreciable period of time all the balancing pockets would eventually be filled with water. If this were to occur, no further balancing could be effected and if the articles againshifted within the container,

described balancing since the water balancing pockets were filled, no

further compensating could be had. It is a further object of our invention to make it possible to continue the centrifugal operation for an indefinite period of time without danger of the water balancing pockets becoming filled. This we accomplish by providing each pocket with one or more drain apertures located in the proper position so that the water may drain from each pocket during the extraction operation. These and other objects of our invention will be apparent to those skilled in the art as the following detailed description proceeds.

In the drawings:

Fig. l is a cross-sectional view of the washing machine showing the general association of the parts thereof that apply to the present invention;

Fig. 2 is a transverse section through the tub on line 2-2 of Fig. 4, in plan, showing the configuration of the balancing pockets and with parts broken away to show the configuration of the channels to direct water to the balancing pockets 7 Fig. 3 is a transverse section through the tub and its mounting taken on line 3-3 of Fig. 2; and

Fig. 4 is a transverse section through the tub taken on line 44 of Fig. 2. I

The over-all structure of the parts of the Washing machine critical to the invention is shown in Fig. 1. The working parts are in a housing H supported by a plurality of legs I. The vertical pedestal member D is carried by the legs and supports the majority of elements of the machine. Tub T is supported by the pedestal and may be given the washing action and the spinning action to be hereinafter described. The tub T ismounted in a water-tight container 2 and water may be pumped into the tub through the connection 3 by any convenient pump means.

A detailed description of the water circulating means and several other features of control which may be employed, will be found in the co-pending application of James B. Kirby, Serial No. 619,849, filed October 2, 1945.

Motor M drives a conventional V-belt or any convenient'driving means to rotate the pulley 5. We may have a speed reduction in the V-belt drive of approximately three to one when using the standard 1750 R. P. M. motor in which case the pulley 5 will turn about 600 R. P. M. which is below the critical speed of the tub. Pulley 5 drives a vertical hollow shaft 6. the lower end of which is supported in the pedestal by bearinglia. and the upper end of which is connected to an upper driving fitting 1. Fitting 1 mounts a bear ing Ito support an upper fitting 8. Fitting 8 carries a member 9, preferablyan aluminum casting, that forms the central part of the'itub. With this construction, the vertical shaft l0 may spin the tub for drying through the universal joint U. The lower portion of shaft [0 is connected to a brake drum II which drum also supports centrifugal clutch shoes 12. During the washing cycle water pressure is not supplied to the operating member B of the brake and spring means l5 or the natural resiliency of the brake band, or both, cause the brake ba'nd'li? to grip the drum I l thereby preventing rotation of shaft l0 and hence of the tub T. Rotation of the pulley 5and hollow shaft 6, however, ispermitted which gives the tub its washingmotion.

A source of water under pressure may connect to a remotely controlled solenoid operated valve 2|. When valve 2| is opened, water entersline 22 and releases the brake operator B against the spring pressure. Simultaneously, another'line 23 conducts water under pressure to the balancing valve V. The controlling means is so arranged that the valve 2| is opened when the machine control is set for drying so that the brake 'is' released to permit the tub to turn and so that the water is available for balancing.

A more detailed view of the tub supporting structure appears in Fig. 3. The fitting 1 that is connected to and rotated by the hollow sleeve 5 supports upper ball bearing 40 described previously, there being a retaining washer 4| for the hearing. The upper fitting8 has an extension 42 and is clamped to the tub casting 9 by means of a nut 43. A pin 44 provides a driving con-" nection between fitting 8 and tub casting 9. The universal joint U has one yoke connected with the tub driving shaft l0 and the other With the upper fitting 8 so that the shaft I0 is always coupled to the tub. 1

As indicated in Fig. 1, during the washing, when Water pressure to brake operator B is cut on", brake band I3 clamps and holds shaft! 0, and by means of universal joint U, the tub is held from rotation. However, it will be noticed that the axis of rotation of the ball bearing 40 and hence that of the tub itself is inclined to the vertical axis defined by shafts 6 and l 0. Thus, during the washing cycle, fitting 1 is rotated by sleeve 8, shaft I 0 and hence the tub are restrained mensweafrom rotation. The tilted bearing Alhcauses the geometric axis of the tub-,to sweep over aconical path having its apex in the universal joint. The universal jointpermitsthis action to take place even thoughthe tub is held from rotation. The result is=that any given point in the, tub has a rapid rising or falling action and different, parts ofth massof water-and articles in the tub T. are reciprocated in a vertical direction with progressi-ve'ly different phases about the center. M I @To initiate the drying action, valve 2-! opened to connect water pressure from line 20 to lines 22 and 23. Now'brake B- releases shaft H) for rotation and water ,under'pressure is. applied to the balancing valve V. During the initial .portionof the drying cycle, thev reactionrof tub T against the wobble 'action c'aused by rotation of. fitting 1 by sleeve-6, fcausesthe tub to gradually assume the 's'pe'edof the rotating sleeve 6. At. a predetermineid velocity of tub rotation, the centrifugal clutch'fmernberv l2 carried bythe. brakev drum ll flies out to engage; a clutch drum -I 2a mounted on the rotating pulley 5.' Now shaft 1.0 is'locked to hollow shaft '6 so that tub spins 'at' the speed imparted topulley 5. Thestructural. details of theclutchstructure are morefully described in the aforesaid pending application of Jam'esM. i by-Q". r

ThetubdT has formed around its circumferenc'e a series of balancing pockets P and with each pocket there isfan associated channelC for directing water released by the, balancing valve V into the pockets. Fastening, means 3li retain the sheet metal structure of thetub to the'centralsupporting casting 9 and a plate 3|.Icloses the lower ends of the, channel C which plate may be fastened to the member-Q' by means of screws 32, Apertures 33 may be provided in. the tub-in between the pocketsin order'to permit water to escape from the tub duringthe' drying'operation.

With the tub spinning below the critical speed, if any unbalance is present, the tub supporting sleeve 6 tendsto lean over in the general direction of the heavy side of the tub. This brings balancingvalve V into operation, theprincipal details of which are seen in Fig. 3. A .more detailed description of the valve can be found in the co-pending' application of Gerald I. Cockerill and Ralph L. Archbold, mentioned previously.

'Thepedestal D supports a metal sleeve member 5.8 to which'is bonded a rubber valve sleeve 5|.

The other element of the valve comprises an innerrelatively non-resilient or metallic member 52 to' which is fastened an upper waterdeflecting cheat-3. An upper portion of the rubber member may be formed with one or more ribs that engage and seal against a smooth tapered'portionformed on the inner valve member 52. The valve parts are farranged to provide an annular pocket 59. which connects. to line 23 so' that water under; pressure may be introduced for balancing. If thereis any unbalance in the tub asit spins, the

tub supporting sleeve '6 willtend to lean inthe direction of the heavy area. This will tend to open up a small'crack or orifice between the rubber member'f il and the tapered portion of metal member 52 at an area generally placed 180 fromtheunbalanced area. -Water under-pressure can thereforeescape between the parts ofthe light or'high side. of the assembly whereupon it is deflected by the disc 53 tofind its way-into one .or.more. of the channels Oformed on the tub.

This water is thereby directed into the water balancingpockets P at the periphery of the tub.

It. can be seenclearly in Fig. 2 that the outlet mouth 35 0f each channel is displacedfrom-the inlet mouth- 38 in thedirection ofspin. :With this "structure, water which leaves the deflector plate 53 enters the channel which happens tolbe radially opposite'th e axis ofwater flow, but due to the time lagspreviously mentioned, the unbalanced-area leads the water stream. However, the entrance to this channel-is not in alignment with the-'a-rea'of unbalance, but is displaced rearwardl-y therefrom so that once thewater enters the. channel, it is directed ahead in the direction of spin toward the area opposite the area of unbalance. v

By; wayof illustrating an application of our invention, we findthat when the average size domestic washer tubrotates at approximately 600.13,. P. M., with ordinary-city water pressures available and with reasonably sized, deflector Plates, a lead angle. of about 45, operates satisfactorily under a range of normal conditions. However, these figuresare merely given. as examples. of a, successful construction. and itis not intended that these examples be consideredas limiting the claims. I

Mention has been made of the reversal of conditions when the tubis operated above the critical speed. .In this case the supporting shaft members flex in a direction tending to. cause the axis. of rotation of the entire. assembly to, coincide withits center of mass. This will result in the shaft and the tub leaning in the opposite direction, due to an" unbalance, than thatjpreviously described. Therefore, the water'emitted from the balancing valve is out of phase from the previously described situation. Nevertheless, it is still desired to direct water to a point displaced 180 from the unbalanced .load which means in the example described that the'water directing channels'should be "formed so that their exit is displaced about fr'orntheir entrance in'a direo tion'opposite to the direction of. spin.

' It will be noted that the water stream leaves the distributing valve and the deflector plate in a' form of aradially directed stream. If the walls of therapidly moving channel adjacent the point of' entry-of the water were also radialjthere would be a splattering of water genera-11y perpendicular to the-main stream axis. However, due to irre'gularities'and numerous similar features, thesplattered water will tend to' deviate'from theperpendicular, which means that a certain amountof water-will be directed out of the channel. It will benoted that in our construction, entrance parts 3'! of the chanel wallare curved 1 iii-the direction of the spin, andwe have found" tha-t'with this structure, most of the splattered Water is directed toward the channel to eventually find its way into the associated balancing pocket." We prefer to form the walls 36 of the channel in a spiral configuration sothat centrif ugal force causes the water to work its way smoothly to the associated balancing pockets.

As the centrifugal action continues and as the articles within the container shift their positions; the point of unbalance'continuously changes sothat various pockets receive balancing water. If the centrifugal action is continued for an appreciable length of time, it is probable that the pockets will eventually be completely filled, whereupon no further balancing action will be obtained. To prevent this condition, we'pro'vide drain apertines 34, and we find that one of such apertures in each pocketprevents the pockets from filling but permits enough water to remain in thezpockets :to achiev normalba'lancing action;

Of course, the higher up the wall the drain 34 is positioned, the larger will be the quantity of water in the pockets before the drain functions. Likewise, the larger the aperture, the greater the drain action. Apertures' 34 are disposed in the zone normally occupied by a belt of water flung against the outer wall of the balancing pockets during extraction and so they continuously tend to drain the pockets. Although we have illustrated a tub which contains eight balancing pockets and eight channels directing water, the number of pockets and the number of channels may be varied without departing from the essence of the invention. Likewise, we contemplate that there may bemore channels than pockets or vice versa. Although our novel balancing structure is particularly useful with the wobble plate, centrifugal type ofwasher illustrated, we contemplate that the channel arrangement and balancing pocket arrangement of this invention could be used on any container which employs centrifugal drying.

Although we have described the invention in connection with a washing machine whereinwater is used as the balancing medium, it is 'contemplated that the arrangement is equally adaptable toa machine for dry cleaning articles by the use of a suitable liquid solvent such as carbon tetrachloride or the like, and in this instance, the solvent would also be employed as the balancing liquid. Also, the rubber would be replaced by a resilient compound, preferably synthetic, which would be unaffected by the particular .liquid'solvent employed. I

These and other modifications may be made withoutdeparting from the spirit of the invention as defined in the appended claims.

What is claimed is:

1. In a washing machine, frame means, a tub, means to support and spin said tub in said frame means for drying, said support means providing for motion of said tub relative to said frame means in. response to tub unbalance while spinning, valve means responsive to tub unbalance to emit a stream of water when tub unbalance is present, said valve means being supported so that there is relative rotation between the valve means and the tub, water balancing means including a plurality of channel means carried by said tub to receive said emitted water, each channel means terminating in a pocket offset from its inlet about the axis of rotation, the offset being of a magnitude and in a direction relative to tub rotation so as to compensate for the time lag between initiation of valve action and entry of water into said channel means, and means. for supplying water under pressure to said valve means.

2. In a washing machine, frame means, a tub, means to support and spin said tub in said frame means for drying, valve means responsive to tub unbalance to emit a stream of water when tub unbalance is present, said valve means being supported so thatthere is relative rotation therebetween and the tub when the latter is spinning, water balancing means including a plurality of channel means carried by said tub having inlets spaced from said valve means to receive said emitted water, each channel means terminating in a pocket offset from its inlet about the axis of rotation, the offset being of a magnitude and in a direction relative to tub rotation so as to compensate for the time lag between initiation of valve action and entry of water into said channel means, orifice means in said pockets for draining fluid during extraction, and means for supplying water under pressure to said valve means.

3. In a washing machine, frame means, a tub, means to support and spin said tub in said frame means for drying, said support means providing for motion of said tub relative to said frame means in response to tub unbalance while spinning, waterbalancing valve means on said frame means comprising a rubber sleeve, a source of water under pressure for said valve means, said valve means being responsive to tub unbalance to emit a stream of water generally directed toward one side of the tub when tub unbalance is present, said valve means being supported so that there is relative rotationtherebetween and the tub-water balancing means including a plurality of channel means carried by said tub to receive said emitted water, the outlet of each channel means being offset from its inlet about the axis of rotation, the offset being of a magnitude and in a direction relative to tub rotation so as to compensate for the time lag between initiation of valve action and entry of water into said channel means. v

4. Liquid extraction apparatus comprising a frame, a tub, an assembly comprising means mounting said tub in the frame for limited gyratory movementand means to spin the tub, support means non-rotatably mounted in said frame, valve means disposed between said support means and portions of said assembly and arranged so that gyration of said tub opens said valve means, a conduit for conducting a source of liquid-under pressureto the inlet of said valve means, water balancing means carried by said tub including a plurality of channels each having an inlet spaced from the outlet of said valve means, each channel terminating in pocket means disposed radially outwardly of and circumferentially offset from the inlet, the offset being of a magnitude and in a direction relative to tub rotation so as to compensate for the time required for liquid to traverse the gap between the outlet of the valve means and the inlets of the channels.

5. Liquid extraction apparatus comprising a frame, a tub, an assembly comprising means mounting said tub in the frame for limited gyratory movement and means to spin the tub, support means non-rotatably mounted in said frame, valve means of rubber-like material disposed be tween said support means and portions of said assembly and arranged so that gyration of said tub compresses and opens said valve means, a conduit for conducting a source of liquid under pressure to the inlet of said valve means, water balancing means carried by said tub including a plurality of channels each having an inlet spaced from the outletof said valve means, each channel terminating in pocket means disposed radially outwardly of and circumferentially offset from the inlet, the offset being of a magnitude and in a direction relative to tub rotation so as to compensate for the time required of liquid to leave the valve and traverse the gap between the outlet of the valve means and the inlets of the channels.

6. In a washing machine, frame means, a tub, means to support said tub by said frame means to provide for motion of said tub relative to said frame means, means to spin said tub for drying, a plurality of circumferentially arranged water balancing pockets on said tub, a plurality of channels on said tub having radially inner openings to receive said water and side walls to direct water to said balancing pockets, valve means opened by relative motion'of said tub and frame means to direct a stream of water into the openings of one or more of said channels disposed on one side of the tub, the radially inner portions of the channel side walls being raked in a direction Onposite to the direction of spin, the radially outer portion of the channel side walls being raked in the direction of spin with the terminus of each channel advanced from its inlet in the direction of tub spin, and means for supplying water under pressure to said valve means.

'7. In a washing machine, frame means, a tub, means to support said tub by said frame means to provide for motion of said tubrelative to said frame means, means to spin said tub for drying, a plurality of circumferentially arranged water balancing pockets on said tub, a plurality of channels on said tub having radially inner openings to receive said water and side walls to direct water to said balancing pockets, valve means opened by relative motion of said tub and frame means to direct a stream of water into the openings of one or more of said channels disposed on one side of the tub, the radially outer portions of the channel side walls being advanced from the inlet in the direction of spin, a portion of said channel walls adjacent the inlet extending generally radially with the inner ends having a circumferential extent that is opposite to the direction of spin in order to insure that all the water directed toward a channel moves radially .outwardly in the channel, and means for supplying water under pressure to said valve means.

8. In a washing machine, frame means, a tub, means to support said tub by said frame means to provide for motion of said tub relative to said frame means, means to spin said tub for drying, a plurality of circumferentially arranged water balancing pockets on said tub, a plurality of channels on said tub having radially inner openings to receive said water and side walls to direct water to said balancing pockets, valve means opened by relative motion of said tub and frame means to direct a stream of water into the openings of one or more of said channels disposed on one side of the tub, the radially outer portions of the channel side walls being advanced from the inlet in the direction of spin, the channel walls being spiral with a portion of the channel walls adjacent the inlet extending generally radially and terminating in a portion that extends circumferentially in a direction opposite to the direction of spin in order to insure that all the water directed toward a channel moves radially outwardly in the channel, the outer portion of said channel walls extending generally,circumferentially in the direction of spin, and means for supplying water under pressure to said valve means. I

9. In a washing machine, frame means, a tub, means to support said tub by said frame means to provide for motion of said tub relative to said frame means, means to spin said tub for drying, a plurality of circumferentially arranged water balancing means on said tub, said balancing means including a plurality of channel means to receive water, valve means opened by relative motion of said tub and frame means to direct a stream of water into one or more of said channels disposed on one side of said tub, the radially outer portion of each channel means being advanced from its inlet portion in the direction of spin, and means for supplying water under pressure to said valve means.

10. In a washing machine, frame means, a tub, means to support said tub by said frame means to provide for motion of said tub relative to said frame means, means to spin said tub for drying, a plurality of circumferentially arranged water balancing pockets on said tub, a plurality of channel means to direct said water to the associated water balancing pockets, valve means opened by relative motion of said tub and frame means to direct a stream of water into one or more of said channels disposed on one side of said tub, the inlet of said channels being spaced from said valve means, the outlet of each channel means being advanced from its inlet in the direction of spin, and means for supplying water under pressure to said valve means.

11. In a washing machine, frame means, a tub, means to support said tub by said frame means to provide for motion of said tub relative to said frame means, means to spin said tub for drying, a plurality of circumferentially arranged water balancing means on said tub, said balancing means including a plurality of channel means to receive said water, valve means opened by relative motion of said tub and frame means to. direct a stream of water into one or more of said channels disposed on one side of said tub, orifice discharge means for each of said balancing means in the radially outer wall of said pockets to gradually drain said balancing means, said orifice discharge means being disposed in a zone normally occupied by water during drying, and means for supplying water under pressure to said valve means.

12. In a washing machine, frame means, a tub, means to support said tub by said frame means to provide for motion of said tub relative to said frame means, means to spin said tub for drying, a plurality of circumferentially arranged water balancing pockets on said tub, a plurality of channel means to direct said water to the associated water balancing pockets, valve means opened by relative motion of said tub and frame means to direct a stream of water into one or more of said channels disposed on one side of said tub, the outlet of each channel means being advanced from its inlet in the direction of spin, orifice discharge means in an outer wall of said balancmg pockets and disposed in the zone normally occupied by water during extraction, and means for supplying water under pressure to said valve means.

ARCHIBALD H. DAVIS. RALPH L. ARCHBOLD.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS 

